MSSQL is also available at any hosting environment I ever looked at. Although PostgreSQL might be available as well now everywhere, MSSQL was a no brainier for web at some point (unless you had extra money to invest in a database for your online app).
For most purposes all databases do fine. You really have to base the choice on how familiar you are with the product, and what other technologies work well with the product. For example, if you're a Microsoft shop, you'd probably go with Microsoft SQL.
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MSSQL is also available at any hosting environment I ever looked at. Although PostgreSQL might be available as well now everywhere, MSSQL was a no brainier for web at some point (unless you had extra money to invest in a database for your online app).
For most purposes all databases do fine. You really have to base the choice on how familiar you are with the product, and what other technologies work well with the product. For example, if you're a Microsoft shop, you'd probably go with Microsoft SQL.